Crime Grade · FBI UCR Data · 2025
Mason City, IA Crime Grade
How Mason City grades for violent crime against every other reporting U.S. city — and against the rest of Iowa — based on the FBI's Uniform Crime Reporting data.
National
7/10
vs. all U.S. cities ≥ 25,000 population
Iowa
7/10
vs. Iowa cities ≥ 10,000 population
In 2025, the violent crime rate in Mason City, IA was 323.8 per 100,000 residents (87 incidents over a population of 26,866). That puts Mason City Infinity% above the U.S. rate of 0.0 and 37% above the Iowa statewide rate of 236.6.
Violent crime rate, 5-year trend
Per 100,000 residents. Mason City (red), Iowa (blue), U.S. average (gray dashed).
Mason City vs. U.S., 2025 — by offense
Rates per 100,000 residents for each offense category.
Full data, last 5 years
Rates per 100,000 residents. Raw counts in parentheses.
| Offense | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|
| Violent crime | 403.0(107) | 292.2(79) | 201.8(54) | 224.0(60) | 323.8(87) |
| Murder | 11.3(3) | 0.0(0) | 3.7(1) | 0.0(0) | 0.0(0) |
| Rape | 52.7(14) | 51.8(14) | 59.8(16) | 100.8(27) | 122.8(33) |
| Robbery | 37.7(10) | 40.7(11) | 18.7(5) | 14.9(4) | 26.1(7) |
| Aggravated assault | 301.3(80) | 199.8(54) | 119.6(32) | 108.3(29) | 174.9(47) |
| Property crime | 2873.8(763) | 2696.8(729) | 3016.4(807) | 2337.0(626) | 2598.1(698) |
| Burglary | 610.2(162) | 451.3(122) | 527.0(141) | 313.6(84) | 528.5(142) |
| Larceny | 1996.2(530) | 2027.2(548) | 2332.4(624) | 1937.6(519) | 1928.1(518) |
| Motor vehicle theft | 237.3(63) | 199.8(54) | 130.8(35) | 70.9(19) | 115.4(31) |
How the Crime Grade is calculated
- Source: FBI Uniform Crime Reporting via the Crime Data Explorer. Agency-level data, pulled directly. No third-party aggregators, no proprietary score.
- Metric: Violent crime rate per 100,000 residents (murder + rape + robbery + aggravated assault), most recent fully-reported year.
- National decile: Mason City's rate placed against all FBI-reporting U.S. cities with population ≥ 25,000. 1 = safest.
- State decile: Same calculation restricted to Iowa cities with population ≥ 10,000.
- Letter grade: 1–3 = A · 4–5 = B · 6–7 = C · 8 = D · 9–10 = F.
- Refresh: Twice a year. The FBI typically releases the prior year's full data each September.
- Limits: The FBI relies on local agency reporting. Rates reflect what was reported, not what occurred.
Want crime data for your application?
SpotCrime's Real-Time Crime Data API delivers incident-level data, not just aggregate grades. Used by family-safety apps, real-estate platforms, executive protection teams, and government agencies.